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This is the factory OEM control transformer for the Carrier PH13NR03600GAFAA heat pump system. The transformer steps down high-voltage line power (115, 208, or 230V) to the 24V AC signal that drives your thermostat, contactor coil, and every control board relay in the system. When this part fails, the entire low-voltage control circuit goes dark — your thermostat shows blank or no response, the contactor never pulls in, and the system won't operate in any mode. It is one of the first components to test when a unit shows zero response despite confirmed line voltage at the disconnect.
Compatibility: Direct OEM replacement for Carrier model PH13NR03600GAFAA heat pump systems. Also cross-references under part number HT01AW229A. Verify your unit's supply voltage and confirm the 60VA/24V secondary rating on your existing transformer's data label before ordering. Have fitment questions? Our HVAC parts team confirms compatibility before you buy — contact us today.